“File not found”, “linker command failed with exit code 1” in Xcode 4.5.1

Steps to resolve:

1. Create new scheme with different name

2. Delete old scheme

3. Add new scheme

Where the problem came from:

I changed my product name and disabled the snapshot option. Then, suddenly, this error popped out:

ld: file not found:.././previousproductname.app/previousproductname

Steps I followed unsuccessfully to debug:

1. Deleted deriveddata, restarted Xcode. – not resolved.

2. Followed the steps of this: link http://twobitlabs.com/2011/06/adding-ocunit-to-an-existing-ios-project-with-xcode-4/ – same error; not resolved.

3. Finally, I changed the Scheme name, deleted my old scheme and added new, have solved my issue.